Post questions and info about safe and unsafe materials that can be or should not be used to construct a launcher. Also post things about different universal accessories for your cannon (breech loader, muzzle break, etc.)

looking back at a few posts i found some links to sites that stocked pressure rated piping, fittings and solenoid valves. not only that some stock both in metric AND imperial, which means our american countertparts' designs will be able to be made exactly by us Brits.
heres a lit of sites which supply stuff: